TwistedBrush Open Studio is a free digital paint and photo editing Windows software package built from the powerful and easy to use TwistedBrush Pro Studio platform. TwistedBrush Open Studio is released as free software that will not expire and is not crippled.
Based off of TwistedBrush Pro Studio, most all the features of the Pro Studio version are included in Open Studio with the exception of features that allow for modification of brushes.
Some of the features included are layers, masks, tablet support, scanner support, over 100 filters, Lua scripting support, a full range im image formats are supported, drawing guides, image warping tools, text support, gradients, tracing paper, reference images, recording to video files and many other standard image editing features.

Added - Solutions! A new feature to easily apply sets of actions to your images to add borders, frames, image enhancements, etc. Accessed from the main menu!

Added - Over 100 solutions added, covering areas such as artist effects, frames, boxes, 3d backgrounds and image enhancements!

Added - Solution script recording mode added to the Script Recording dialog. Recorded script in proportional size and position. Very useful for recording actions that can be applied to different sized pages.

Added - Step and Skip options on script playback to allow single stepping and skipping script commands.

Added - The color mixing palettes now have versions without the grid lines. You will need to select the color palette with the suffix "Smooth" from the load color palette dialog.

Added - Filters Smart Blur, Noise Reduction and Noise Reduction RGB.
Added - Filters Surface Blur and Noise Reduction 2 added. (Bilateral filter)
Added - Channel filter. To isolate the RGBA channels. Found in the Filters | Color menu.

Added - Reflection filter. Works on the transparent regions of your layer, with falloff.
Added - Stretch Edge filter. Similar to the Stretch filter but allow stretching from any combination of the 4 edges.
Added - Fader filter. Allows adjusting the alpha, saturation or luminance of the image or object on a gradient.
Added - Warp Edge filter. Allows distortion of one edge by perspective, skew and inset all at once.
Added - A new mode of HSL Range added to the Wand Mask tool. Considers hue, saturation and luminance.
Added - New category of filters Mask Generation. The filters in this section will generate masks based on image information. This gives finer control that what is possible with the Wand Mask tool.
Added - New filter, Mask Generate HSL. Create a mask from image HSL values with separate tolerances for each channel (H, S and L).
Added - New filter, Borderize. Found in the Stylized section. It is used for creating borders from the exiting image data.
Added - Filter Warp 3 point. Allows adjusting the x and y position of 3 corners of an object.
Improved - The Vignette filter gets a new flag for fixed sized edges.

Improved - The Vignette filter is improved for working with transparent layers.
Improved - Script playback is improved when working with layers.
Improved - The Alpha Filter actions are now recorded in scripts.
Improved - The Bevel Filter gets a new flag for proportional size edges.
Improved - The Page Resize action is now recorded in scripts.
Improved - The line tool script recording only records the final line instead of each incremental line position as it's drawn.
Improved - The line tool has a repeat option now to randomly repeat the line up to 100 times on the page.
Improved - On the Script Player dialog the running script log now includes the total line count as well as the current line the script is processing.

Improved - The Gaussian filter gets a new proportional flag.
Improved - Allow layers of different mixing modes to be merged. A confirmation is given.
Improved - When using the Mask Filter show the mask fully opaque as a grayscale image to allow for better visualization of the filter previews.
Improved - Export and Import buttons added to the Script Play dialog to make it easier to save or load scripts from other locations.
Improved - Reduction of redundant commands recorded in scripts.
Improved - The Perspective, Warp, Stretch, Horizontal Pivot, Vertical Pivot and Skew filters get an options flag call Isolate Object that allows for automatically finding the image data on a layer and basing the distortion on it's location.
Improved - Added Proportional flag to the Generate Noise filter.
Changed - The Vignette filters blur amount is now proportional to the size of the page.
Changed - Adjusted the default settings for the Unsharp Mask filter to be more moderate.
Changed - Completely reworked the Drop Shadow filter.
Fixed - In the Brush Effects panel the Blend Trace effect was hiding the envelope columns when it shouldn't.
Fixed - Full scene script recordings were not always playing back properly.
Fixed - The Auto Dismiss toggle of the popup tools panel was not updating on some systems.
Fixed - The Vignette filter was not properly covering the full range of the image in rectangle mode.
Fixed - The brush cursor was not showing during script playback.
Fixed - The position readouts for the Rectangle and Ellipse tools were not correct when not at the normal zoom level.
Fixed - After using the standard Windows Color Select dialog on the color squares mouse movement continued to adjust the sliders.
Fixed - Using filters when a mask was present could result in fully opaque areas of the image becoming slightly transparent in areas even where there was no mask.

Fixed - Doing a Copy when a mask is present could result in fully opaque areas of the image becoming slightly transparent in areas even where there was no mask.
Fixed - Various tools were not drawing at full opacity. Tools include, rectangle, ellipse, gradient and flood fill.
Fixed - When merging a fully opaque layer into another layer with the normal mixing mode some color resolution was lost.
Fixed - The Adjust HSL filter was giving slightly wrong results.
Fixed - The Lua Script command gethsl() was giving slightly incorrect results.